Sand-slinging machine



' Aug.l9, 1930. E, P. JANSSQN 1,773,694

SAND SLINGING MACHINE Filed May 12, 1928 2 Sheets-Sheet 1 Aug. 19, 1930. E. P. JANSSON SAND SLING-ING' MACHINE Fil ed May 12, 1928 2 Sheets-Sheet 2 In van/0r fr/K' 50/50/1680!) l9/f'orney.

Patented Aug. 19, 1930 Farm 1 OFFICE ERIK rArRIK iaivsson, or EKSJ'O, SWEDEN, assrenon T A'KTIEBOLAGET AXEL CHRISTIER-NSSON, or STOCKHOLM, swnnnn, A COMPANY or swnnnn, AND AKTIE- BOLAGET EKSJO MEKANISKA VERKS'IAD, on EKSJ'O, swnnnn, A COMPANY or SWEDEN sANn-sLiNome MACHINE Application filed May 12, 1928, Serial No. 277,327, and in Sweden May 12, 1927.

' bins and the like. Machines adapted for this operated more or less intermittently.

purpose are previously known which are provided with a rotary scoop like member Which collects the sand and slings it to the desired place. These old machines operate intermittently, however, since naturally there will be certain time intervals in the feeding of the sand by the scoop.

It has also been proposed to provide an apparatus for the same purpose involving arotating member having a peripheral groove or pockets into which the sand is introduced externally at one point inthe circle of rotation and in which the sand is retained by an endless belt. As a further development of the lastmentioned machine and in order to render it possible to feed the sand, to the pockets from an internal point of the rotating member, it has also been proposed to make the rotary slinging member as a hollow rotary body or drum which is provided at one side in the axial direction with a charging or inlet opening for the sand, and with a peripheral groove or slot for slinging out the sand by centrifugal force, said groove or slot being covered along a portion of the periphery of the rotary drum by means of a belt which bears against said periphery and takes part in the motion of the rotary drum, so that during the rotation of the drum the sand is retained within the drum during rotation through that angle which is covered by the belt, until the sand is thrown out at the point where the belt leaves the drum. In said construction the peripheral groove or slot was divided by a series of vanes reaching to the periphery of the drum into a number of pockets, and such machines have therefore riso ccording to the present invention, however, a continuous and uniform slinging of the sand is obtained.

The present invention is an improvement on the machine last referred to, and consists in that the peripheral groove or slot which communicates with the hollow interior of the rotary drum, is continuous and unbroken along the entire circumference of the rotary drum. The rotary drum is thus not provided with any vanes dividing the peripheral slot into pockets. Thesand will therefore have equal access to all points of the peripheralslot and will be evenly distributed all along the same, so that the stream of sand thrown out at the point where the belt leaves the drum will be continuous as well as uniform and even. 4

.An embodiment of the invention is illustrated in the accompanying drawings, in which Figs. 1 and 2 show a sand slinging machine according to the invention, viewed from the side and in vertical axial section, respectively, andfFig. 3 shows a detail of the same.

The rotary body or drum is composed of two outwardly convex members or bowls 1 and 2 secured by means of bolts 3 in such manner that a space is formed betweensaid two members-1 and 2 for receiving the sand, and anarrow peripheral opening4 between the edges of said members. The rotary drum 1-2 is secured to a driving shaft 6 rotatably journalled in the machine frame 5, bymeans of which shaft the rotary drum is put in rotation. Three belt pulleys 7, 8 and 9 are also rotatablv journ'alled in the frame 5. The pulleys and-S'are secured to shafts 10 and 11, respectively, which are journalled in slides '12 andl3, respectively, which may be moved in a direction towards'and away from the rotary drum 12 by means of hand-wheels 14 and 15, respectively, which bear against the frame 5 and through which screw spindles 16 and 17 respectively, pass, which are secured to the slides 12 and 18, respectively. A belt 18 runs over the pulleys 7 8 and 9 and over a portion of the periphery of the rotary drum -12 so that it covers a portion of the opening or slot 4. One member 1 of the'rotary drum is providedwith a side opening 19 into the lower portion of which a hopper 20 for the sand projects.

A rod 21 is provided on each side of the frame 5 and is slidable in a bearing 22 which is pivoted to the frame 5. Each such rod 21 rests on a roller 23 rotatably mounted on the frame 5.

Pivoted to the left-hand outer ends of. the

rods 21, as viewed in Fig. 1, is a plate 24 which is thus movable vertically. Said plate 24 is upwardly convex in cross section and bent downwards in longitudinal section, and is also tapering towards its outer end. The plate 24 may be rotated around'its pivot by means of a screw gearing 26 which may be operated by means of a hand-wheel 25. A handle 27 secured to the upper side of the late 24; serves to raise said plate 24 by swinging the rods 21 and to move said rods longitudinally. The frame 5 is rotatable on a base 29 by the intermediary of balls 28.

The sand is introduced through the hopper 20 in the rotary drum 12 and is forced by the centrifugal force against the belt 18 which it follows to the upper point of the rotary drum 1-2 where the belt 18 leaves the drum and thus lays the opening or slot' l free, so that the sand is slung against the plate 24, as shown in Fig. 1. Owing to the tapering and convex shape of the plate 2 1 the sand is collected to a thin jet which, owing to the bentdown shape of said p1ate,is directed against the moulding box 30 in which the sand is packed.

By rotating the plate 24 by means of the hand-wheel 25 and by raising or lowering said plate by swinging the rods 21 in the vertical plane, the packing of the sand in the moulding box may be regulated. By longitudinal displacement of the rods 21 and by rotating the frame 5the sand jet may be directed to every desired point within a large moulding box or to different boxes.

By raising the belt pulley 7 by means of the hand-wheels 14 the sand jet may be directed upwards, so that the machine may be used for slinging the sand up into bins and the like, in which case the rods 21 and the plate 24 are not used. Such raising of the pulley 7 necessitates, of course, a change of the position of one of the other belt pulleys 8 and 9, if it shall not be necessary to change the length of the belt. For this purpose the belt pulley 8 may be moved inwards by turning the hand- Wheels 15, to the same extent as the pulley 7 is raised, and vice versa. \Vhile in the embodiment illustrated in the drawings two hand- Wheels 14:, or 15, respectively, are provided for effecting adjustment of each pulley, it is of course possible instead to make such arrangement that said adjustment is effected by means of a single hand-Wheel, in which case the two slides 12, or 13, respectively, are rigidly connected by means of a cross piece, to which a screw is secured which passes through the hand wheel.

nation of a base, a frame rotatably mounted on said base, a hollow drum rotatable in said frame, said drum having an axially located filling opening and a. peripheral slot communicating with the hollow of said drum and which is continuous and unbroken along the entire circumference of said rotary drum, and a belt bearing against the circumference of said drum and covering said slot over a portion of the periphery of said drum.

ERIK PATRIK JANSSON.

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